题目内容
They didn’t go to bed ________ they finished their homework.
| A．when | B．because | C．until | D．if |
解析试题分析：句意：直到完成作业他们才去睡觉。not…until 意为：直到……才；when当……时候；because因为；if如果。故选C。
考点: 考查连词的用法。
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